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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

26127 results found.

  1. GRB 070809: ROTSE-III Optical Limits
  2. GRB 070809: Swift detection of a short burst
  3. GRB 070808 : Faulkes Telescope South Observations
  4. GCN Swift XRT update position notices and enhanced position circulars
  5. GRB 070808: Swift XRT refined analysis
  6. GRB 070808, Swift-BAT refined analysis
  7. GRB 070808: OPTIMA-Burst optical upper limit
  8. GRB 070808: Xinglong TNT optical Upper Limit
  9. GRB070808 - SDSS Pre-Burst Observations
  10. GRB 070808: ROTSE-III Optical Limits
  11. GRB 070808: Swift detection of a burst
  12. GRB061121A: PROMPT Observations
  13. GRB070805 XRT and UVOT afterglow candidate
  14. Swift trigger on 4U 1700-377 while star tracker loss-of-lock
  15. GRB070612A: Radio upper limit from GMRT
  16. GRB 070721B: correct afterglow position
  17. Swift/UVOT observations of GRB070805
  18. GRB 070805, Swift-BAT refined analysis
  19. GRB 070805: Swift XRT initial analysis.
  20. GRB 070805: Swift/UVOT initial analysis
  21. GRB 070805: Swift detection of a burst
  22. UVOT observations of SAXJ1810.8-2609
  23. Swift detection of a outburst from SAX J1810.8-2609
  24. VLA non-detection of GRB 070721B
  25. GRB 070802: REM optical observations
  26. GRB 070724B: Swift-XRT afterglow confirmation
  27. GRB 070802: Swift-XRT refined analysis
  28. GRB070802: Swift/UVOT upper limits
  29. GRB 070802: Confirmation of the optical afterglow
  30. GRB 070802, Swift-BAT refined analysis
  31. GRB 070802: VLT redshift
  32. GRB 070802: refined Swift XRT position
  33. GRB 070802: V-band detection of the candidate afterglow
  34. GRB 070802: LCO I-band candidate
  35. GRB 070802: GROND J band candidate
  36. GRB 070802: LCO optical observations
  37. GRB 070802: Swift detection of a burst
  38. GRB 070731, Swift-BAT refined analysis
  39. Konus-A observation of GRB 070729
  40. Swift/UVOT detection of GRB070714B
  41. GRB 070729: LCO optical imaging
  42. VLA upper limit on short hard burst GRB 070714B
  43. GRB070729: Swift/UVOT upper limits
  44. GRB 070729: Swift-XRT refined analysis
  45. GRB 070729, Swift-BAT refined analysis
  46. GRB 070729: Magellan NIR Observations
  47. GRB 070724B: P60 Observations
  48. GRB 070729: Swift detection of a short hard burst
  49. GRB 070724B: Swift/UVOT Upper limits
  50. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  51. GRB 070724B: Swift-XRT afterglow likely candidate
  52. GRB 070721A: optical observations
  53. GRB 070724B: Swift-XRT afterglow candidates
  54. Four radio sources in Swift-XRT error box of GRB 070724
  55. GRB 070724: optical observations
  56. GRB 070724: P60 and Gemini Observations
  57. GRB 060814 - Keck host detection and redshift
  58. GRB 070724: IR observations
  59. GRB 070724: Closer association with DSS source
  60. Swift/UVOT refined analysis of GRB070724
  61. GRB 070724: Swift-XRT Team refined analysis
  62. GRB 070724: Pre-Imaging Shows a Source in the XRT Error Circle
  63. Short-Hard GRB070714B: PROMPT Observations
  64. GRB 070724, Swift-BAT refined analysis of a short burst
  65. GRB 070721B: further observations and analysis
  66. GRB 070724: Swift detection of a burst
  67. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  68. GRB 070714B: Keck observations
  69. GRB 070721B: optical observations and proposed redshift
  70. Swift/UVOT observations of GRB070721B optical afterglow.
  71. GRB 070721B, Further Swift-BAT refined analysis
  72. Swift/UVOT Observations of GRB070721A
  73. GRB 070721B : Faulkes Telescope South observations
  74. GRB 070721B: Swift-XRT refined analysis
  75. GRB 070721A : Faulkes Telescope South optical limit
  76. GRB 070721A: Swift/XRT refined analysis
  77. GRB 070721B, Swift-BAT refined analysis
  78. GRB 070721A, Swift-BAT refined analysis
  79. GRB070721B: A bright UVOT candidate
  80. GRB 070721B: Swift detection of a burst
  81. GRB 070721: Swift detection of a possible burst
  82. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  83. GRB 070714B : Suzaku WAM observation of the prompt emission
  84. GRB 070714A: Swift-BAT T_zero
  85. GRB070714B: TNG NIR observations
  86. GRB 070714A: Swift/UVOT Upper limits
  87. GRB 070714B: Swift/UVOT Upper Limits
  88. GRB 070714B: Swift-BAT spectral lag for the SHB
  89. GRB 070714B: confirmation of optical afterglow
  90. GRB 070616: No Evidence for I Band Afterglow
  91. GRB 070714A: Swift XRT refined analysis
  92. GRB070714B: Swift-XRT refined analysis
  93. GRB 070707: Swift-XRT follow-up observations
  94. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  95. GRB 070714 ("Bastille"): Optical Pre-Imaging
  96. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  97. GRB 070714A, Swift-BAT refined analysis
  98. GRB 070714 : Liverpool Telescope optical counterpart ?
  99. GRB 070714: Swift detection of a bright burst, possibly short
  100. Swift detection of a possible burst (Trigger 284850)

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